Alcatraz was a prison that was created to keep people behind bars. It was escape proof. It's occupants resigned themselves to their fate. They were prisoners and they would never be free.
Can you identify with that feeling? Like you'll never shake loose the chains in your life? Like you will always be a prisoner?
But there is hope. The bible tells us that Jesus came to set the captives free and who the son sets free is free indeed! You don't have to be in chains any longer because Jesus, the great chain breaker, is here to set you free.